Mineral (Processed Alloy)

Small pale stone fragment (undetermined)

Unidentified; the image lacks diagnostic detail for a reliable identification

Unidentified metallic mineral or meteorite fragment

Indeterminate; possible native metal-bearing sulfide or iron meteorite fragment

Arsenopyrite in Quartz Matrix

Arsenopyrite (FeAsS) with Quartz (SiO2)

Granite fragment

Granite (Felsic Plutonic Rock)

Granite

Intrusive Igneous Rock (Felsic)

Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Mixed collection of rocks and minerals

Assorted specimens; visible pieces may include quartz, feldspar, jasper, and other common minerals, but individual identification is uncertain from the image

Likely blue mineral or tumbled stone

Unidentified; the image is too blurry for reliable identification

Kidney Stone

Calcium Oxalate (CaC2O4·nH2O)

Chalcopyrite

Chalcopyrite (CuFeS2)

Turquoise cabochon

Turquoise; hydrated copper–aluminum phosphate, approximately CuAl6(PO4)4(OH)8·4H2O (composition varies)

Blue Apatite

Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)

Spinifex Texture Komatiite

Komatiite (Ultramafic Volcanic Rock)

Moqui Marble

Hematite-Goethite Concretion (Fe2O3 / FeO(OH))

Shark Tooth Fossil

Chondrichthyes fossilized tooth

Fossil Shark Tooth

Chondrichthyes (class)

Small tan rock fragment

Unidentifiable lithic fragment; mineral composition undetermined

Apophyllite cluster

Fluorapophyllite-(K), KCa4(Si8O20)(F,OH)·8H2O

Fossilized Tooth Fragment

Vertebrate Fossil (Mammalia indet.)

Blue-green rough mineral specimen (identity uncertain)

Undetermined; the image is insufficient for a reliable mineral identification

Snowflake Obsidian

Volcanic Glass with Cristobalite Inclusions

Polished iron meteorite fragment

Iron meteorite, chiefly kamacite and taenite (Fe–Ni alloys), possibly weathered or etched

Black Tourmaline

Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)

Emerald

Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.

Gemstone ring (stone not identifiable)

Unknown; the small central stone may be a colorless gemstone or glass, and the surrounding metal is gold-colored alloy

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Kidney Stone

Nephrolith (typically Calcium Oxalate - CaC2O4)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)

Kidney Stone

Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)

Leopard Skin Jasper

Microcrystalline Quartz (SiO2)

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Small dark mineral or rock fragment (not identifiable from the image)

Undetermined; the specimen is too small and lacks visible diagnostic features for a reliable identification.

Small dark rock fragment (unidentified)

Undetermined; the image is insufficient for reliable mineral or rock identification

Unidentified dark-gray rock fragment

Undetermined; the photo is insufficient for reliable mineral or rock identification

Likely dark polished stone bead or cabochon

Undetermined; the image is too blurry to identify its composition reliably

Hematite

Iron Oxide (Fe2O3)

Fossilized Bone Fragment

Vertebrate Fossil

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Petrified Wood

Silicified Wood (primarily SiO2)

Banded Gneiss

Gneiss (SiO2 enriched metamorphic rock)

Purpurite

Manganese Iron Phosphate, Mn3+(PO4)

Shark Tooth Fossil

Vertebrate fossilized tooth